Ch 14 Work Sampling

Ch 14 Work Sampling - Work Sampling 11 Work Sampling...

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11 Work Sampling
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22 Work Sampling Advantages Ø Does not require continuous observation over a long period of time Ø Clerical time is diminished Ø Total work hours expended by analyst usually much fewer Ø Crew operations can readily be studied by a single analyst
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33 Theory of Work Sampling Ø Binomial Distribution l (p + q)n = 1 l Where: l p = probability of occurrence l q = 1 – p = probability of non-occurrence l n = number of observations Ø As n becomes large, the Binomial Dist can be approximated by the Normal Distribution l μ = p l σ2 = (pq/n)
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44 Fig 14-3 Cumulative percentage of running time
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55 Work Sampling- Sample Size σ p = (pq/n).5 = (p(1-p)).5 Let Z α /2 σ p be the acceptable limit of error ε at a (1- α )100% confidence error, where: ε = Z α /2 σ p = Z α /2 ( pq/n).5 Solving for n: n = Z2 α /2 pq/ ε 2
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66 Example- Sample Size Determination A work sampling is examining 10 machines at each observation point to find the % idle time. After 25 observations (250 data points) the value
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Ch 14 Work Sampling - Work Sampling 11 Work Sampling...

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